//判断本地时间是否在 时间区间内
//time1 开始日期
//time2 结束日期



function func(time1, time2) {
	var time = Date.parse(new Date());
	var date1 = Date.parse(new Date(time1.replace(/-/g, '/')));
	var date2 = Date.parse(new Date(time2.replace(/-/g, '/')));
	if (date1 < time && date2 > time) {
		return true;
	};
	return false;
}
if (func('2020-04-03 23:59:59', '2020-04-05 00:00:01')) {
	document.writeln("<style type=\"text/css\">");
	document.writeln(".site-gray, html{");
	document.writeln("filter: gray !important;");
	document.writeln("filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);");
	document.writeln("filter: grayscale(100%);");
	document.writeln("-webkit-filter: grayscale(100%);");
	document.writeln("-moz-filter: grayscale(100%);");
	document.writeln("-ms-filter: grayscale(100%);");
	document.writeln("-o-filter: grayscale(100%);");
	document.writeln("}");
	document.writeln("</style>");

	var grayscale = (function() {

		var config = {
				colorProps: ['color', 'backgroundColor', 'borderBottomColor', 'borderTopColor', 'borderLeftColor', 'borderRightColor', 'backgroundImage'],
				externalImageHandler: {
					/* Grayscaling externally hosted images does not work
					   - Use these functions to handle those images as you so desire */
					/* Out of convenience these functions are also used for browsers
					   like Chrome that do not support CanvasContext.getImageData */
					init: function(el, src) {
						if (el.nodeName.toLowerCase() === 'img') {
							// Is IMG element...
						} else {
							// Is background-image element:
							// Default - remove background images
							data(el).backgroundImageSRC = src;
							el.style.backgroundImage = '';
						}
					},
					reset: function(el) {
						if (el.nodeName.toLowerCase() === 'img') {
							// Is IMG element...
						} else {
							// Is background-image element:
							el.style.backgroundImage = 'url(' + (data(el).backgroundImageSRC || '') + ')';
						}
					}
				}
			},
			log = function() {
				try {
					window.console.log.apply(console, arguments);
				} catch (e) {};
			},
			isExternal = function(url) {
				// Checks whether URL is external: 'CanvasContext.getImageData'
				// only works if the image is on the current domain.
				return (new RegExp('https?://(?!' + window.location.hostname + ')')).test(url);
			},
			data = (function() {

				var cache = [0],
					expando = 'data' + (+new Date());

				return function(elem) {
					var cacheIndex = elem[expando],
						nextCacheIndex = cache.length;
					if (!cacheIndex) {
						cacheIndex = elem[expando] = nextCacheIndex;
						cache[cacheIndex] = {};
					}
					return cache[cacheIndex];
				};

			})(),
			desatIMG = function(img, prepare, realEl) {

				// realEl is only set when img is temp (for BG images)

				var canvas = document.createElement('canvas'),
					context = canvas.getContext('2d'),
					height = img.naturalHeight || img.offsetHeight || img.height,
					width = img.naturalWidth || img.offsetWidth || img.width,
					imgData;

				canvas.height = height;
				canvas.width = width;
				context.drawImage(img, 0, 0);
				try {
					imgData = context.getImageData(0, 0, width, height);
				} catch (e) {}

				if (prepare) {
					desatIMG.preparing = true;
					// Slowly recurse through pixels for prep,
					// :: only occurs on grayscale.prepare()
					var y = 0;
					(function() {

						if (!desatIMG.preparing) {
							return;
						}

						if (y === height) {
							// Finished!
							context.putImageData(imgData, 0, 0, 0, 0, width, height);
							realEl ? (data(realEl).BGdataURL = canvas.toDataURL()) :
								(data(img).dataURL = canvas.toDataURL())
						}

						for (var x = 0; x < width; x++) {
							var i = (y * width + x) * 4;
							// Apply Monoschrome level across all channels:
							imgData.data[i] = imgData.data[i + 1] = imgData.data[i + 2] =
								RGBtoGRAYSCALE(imgData.data[i], imgData.data[i + 1], imgData.data[i + 2]);
						}

						y++;
						setTimeout(arguments.callee, 0);

					})();
					return;
				} else {
					// If desatIMG was called without 'prepare' flag
					// then cancel recursion and proceed with force! (below)
					desatIMG.preparing = false;
				}

				for (var y = 0; y < height; y++) {
					for (var x = 0; x < width; x++) {
						var i = (y * width + x) * 4;
						// Apply Monoschrome level across all channels:
						imgData.data[i] = imgData.data[i + 1] = imgData.data[i + 2] =
							RGBtoGRAYSCALE(imgData.data[i], imgData.data[i + 1], imgData.data[i + 2]);
					}
				}

				context.putImageData(imgData, 0, 0, 0, 0, width, height);
				return canvas;

			},
			getStyle = function(el, prop) {
				var style = document.defaultView && document.defaultView.getComputedStyle ?
					document.defaultView.getComputedStyle(el, null)[prop] :
					el.currentStyle[prop];
				// If format is #FFFFFF: (convert to RGB)
				if (style && /^#[A-F0-9]/i.test(style)) {
					var hex = style.match(/[A-F0-9]{2}/ig);
					style = 'rgb(' + parseInt(hex[0], 16) + ',' +
						parseInt(hex[1], 16) + ',' +
						parseInt(hex[2], 16) + ')';
				}
				return style;
			},
			RGBtoGRAYSCALE = function(r, g, b) {
				// Returns single monochrome figure:
				return parseInt((0.2125 * r) + (0.7154 * g) + (0.0721 * b), 10);
			},
			getAllNodes = function(context) {
				var all = Array.prototype.slice.call(context.getElementsByTagName('*'));
				all.unshift(context);
				return all;
			};

		var init = function(context) {

			// Handle if a DOM collection is passed instead of a single el:
			if (context && context[0] && context.length && context[0].nodeName) {
				// Is a DOM collection:
				var allContexts = Array.prototype.slice.call(context),
					cIndex = -1,
					cLen = allContexts.length;
				while (++cIndex < cLen) {
					init.call(this, allContexts[cIndex]);
				}
				return;
			}

			context = context || document.documentElement;

			if (!document.createElement('canvas').getContext) {
				context.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayscale=1)';
				context.style.zoom = 1;
				return;
			}

			var all = getAllNodes(context),
				i = -1,
				len = all.length;

			while (++i < len) {
				var cur = all[i];

				if (cur.nodeName.toLowerCase() === 'img') {
					var src = cur.getAttribute('src');
					if (!src) {
						continue;
					}
					if (isExternal(src)) {
						config.externalImageHandler.init(cur, src);
					} else {
						data(cur).realSRC = src;
						try {
							// Within try statement just encase there's no support....
							cur.src = data(cur).dataURL || desatIMG(cur).toDataURL();
						} catch (e) {
							config.externalImageHandler.init(cur, src);
						}
					}

				} else {
					for (var pIndex = 0, pLen = config.colorProps.length; pIndex < pLen; pIndex++) {
						var prop = config.colorProps[pIndex],
							style = getStyle(cur, prop);
						if (!style) {
							continue;
						}
						if (cur.style[prop]) {
							data(cur)[prop] = style;
						}
						// RGB color:
						if (style.substring(0, 4) === 'rgb(') {
							var monoRGB = RGBtoGRAYSCALE.apply(null, style.match(/\d+/g));
							cur.style[prop] = style = 'rgb(' + monoRGB + ',' + monoRGB + ',' + monoRGB + ')';
							continue;
						}
						// Background Image:
						if (style.indexOf('url(') > -1) {
							var urlPatt = /\(['"]?(.+?)['"]?\)/,
								url = style.match(urlPatt)[1];
							if (isExternal(url)) {
								config.externalImageHandler.init(cur, url);
								data(cur).externalBG = true;
								continue;
							}
							// data(cur).BGdataURL refers to caches URL (from preparation)
							try {
								var imgSRC = data(cur).BGdataURL || (function() {
									var temp = document.createElement('img');
									temp.src = url;
									return desatIMG(temp).toDataURL();
								})();

								cur.style[prop] = style.replace(urlPatt, function(_, url) {
									return '(' + imgSRC + ')';
								});
							} catch (e) {
								config.externalImageHandler.init(cur, url);
							}
						}
					}
				}
			}

		};

		init.reset = function(context) {
			// Handle if a DOM collection is passed instead of a single el:
			if (context && context[0] && context.length && context[0].nodeName) {
				// Is a DOM collection:
				var allContexts = Array.prototype.slice.call(context),
					cIndex = -1,
					cLen = allContexts.length;
				while (++cIndex < cLen) {
					init.reset.call(this, allContexts[cIndex]);
				}
				return;
			}
			context = context || document.documentElement;
			if (!document.createElement('canvas').getContext) {
				context.style.filter = 'progid:DXImageTransform.Microsoft.BasicImage(grayscale=0)';
				return;
			}
			var all = getAllNodes(context),
				i = -1,
				len = all.length;
			while (++i < len) {
				var cur = all[i];
				if (cur.nodeName.toLowerCase() === 'img') {
					var src = cur.getAttribute('src');
					if (isExternal(src)) {
						config.externalImageHandler.reset(cur, src);
					}
					cur.src = data(cur).realSRC || src;
				} else {
					for (var pIndex = 0, pLen = config.colorProps.length; pIndex < pLen; pIndex++) {
						if (data(cur).externalBG) {
							config.externalImageHandler.reset(cur);
						}
						var prop = config.colorProps[pIndex];
						cur.style[prop] = data(cur)[prop] || '';
					}
				}
			}
		};

		init.prepare = function(context) {

			// Handle if a DOM collection is passed instead of a single el:
			if (context && context[0] && context.length && context[0].nodeName) {
				// Is a DOM collection:
				var allContexts = Array.prototype.slice.call(context),
					cIndex = -1,
					cLen = allContexts.length;
				while (++cIndex < cLen) {
					init.prepare.call(null, allContexts[cIndex]);
				}
				return;
			}

			// Slowly recurses through all elements
			// so as not to lock up on the user.

			context = context || document.documentElement;

			if (!document.createElement('canvas').getContext) {
				return;
			}

			var all = getAllNodes(context),
				i = -1,
				len = all.length;

			while (++i < len) {
				var cur = all[i];
				if (data(cur).skip) {
					return;
				}
				if (cur.nodeName.toLowerCase() === 'img') {
					if (cur.getAttribute('src') && !isExternal(cur.src)) {
						desatIMG(cur, true);
					}

				} else {
					var style = getStyle(cur, 'backgroundImage');
					if (style.indexOf('url(') > -1) {
						var urlPatt = /\(['"]?(.+?)['"]?\)/,
							url = style.match(urlPatt)[1];
						if (!isExternal(url)) {
							var temp = document.createElement('img');
							temp.src = url;
							desatIMG(temp, true, cur);
						}
					}
				}
			}
		};

		return init;

	})();

	var navStr = navigator.userAgent.toLowerCase();
	$(function() {

		if (navStr.indexOf("msie 10.0") !== -1 || navStr.indexOf("rv:11.0") !== -1) { // 判断是IE10或者IE11
			grayscale(document.body);
			//grayscale(document.getElementsByTagName("img"));
		}
		$("html").addClass("site-gray");
	});
}